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  • Block Node Commands
    • Whether or not to block outgoing commands from MQTT Engine to Edge Nodes. This is true by default and provides a security mechanism for preventing accidental outgoing commands from MQTT Engine.
  • Block Device Commands
    • Whether or not to block outgoing commands from MQTT Engine to Devices. This is true by default and provides a security mechanism for preventing accidental outgoing commands from MQTT Engine.
  • File Policy
    • The policy for handling Files contained within a Sparkplug payload.
      • Ignore: The default policy. The file will be ignored.
      • Store: The file will be stored to the local file system in the directory specified by the File Location field.  A Tag will be created with a String value representing the file URI.
  • File Location
    • The directory to store the files when using the Store policy described above.
  • Store Historical Events
    • Whether or not to write historical change events directly to the Historian (if history is enabled on a Tag) instead of updating the live Tag value.

Advanced

  • Enable Tag Latching

    • Whether or not to enable Tag latching to synchronize MQTT Tag updates with events in Ignition.

  • Latch Timeout

    • The amount of time to wait for a Tag latch to be released before timing out.

  • Latch Tags

    • A list of Trigger Tag and Latch Tag pairs.

  • Enable Primary Host Subscriptions

    • Whether or not to enable MQTT Engine subscriptions on STATE/# and State/# topics even when a PrimaryHostID is not configured within MQTT Engine. This setting is for debugging purposes only.

  • Enable BD Sequence Validation

    • Whether or not to enable BIRTH/DEATH sequence number validation (required by Sparkplug specification).

Servers

The second tab is a list of MQTT Servers that MQTT Engine should connect to.  By default, MQTT Engine is configured to connect to the local MQTT Distributor based MQTT Server.  It is set up to connect to localhost, port 1883, using the default username/password pair of admin/changeme.  Out of the box MQTT Engine will work with MQTT Distributor and its default configuration.  The connection status of each server can be seen in the 'Status' column.  Clicking on the 'Create new MQTT Server' link will bring up the following form for adding a new MQTT Server setting.

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